Malicious PDF — malware analysis report

Static analysis result for SHA-256 766f6be33737f420…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 14:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dde4d6e2c3ad80027c8676844393e1f SHA-1: 64b8aa777c17a796dbac02f18ae5c7891add9b45 SHA-256: 766f6be33737f420f627c9f8c1d43b2d7a42f349bb16338afd7cad12afabcd3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised CMS upload directories. These links are likely intended to lure users into downloading malicious files or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests a link farm designed for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5ae62ed---51278462776.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fccf207b---gilan.pdfIn PDF document text
    • https://ekransamara.ru/files/98280563157.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/xibamifusajadanewadagow.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/83104151482.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/37147061c066a3d0704edb8caa33f29b/rodobokinojusinop.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s1uno6947radi68es28v1d7fr/fovun.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f9ee9460---2338830734.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/60436578669.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sokowuj.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/37875657475.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/puridaxulivif.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/87402b61100916175b785e8b4a2be919/tiwamesozu.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/31462726453.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074253d96961---setetemejupowovalise.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/270544555395.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/togebimogiwape.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3b7deffa---judutevokuzanozorove.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5951e9af---magijibakedanisodaxebari.pdfIn PDF document text
    • https://estoniapools.com/contents//files/mavadupakifitozute.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9290baff---zozewusud.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e85de26707495574cc7cf1fa3f1dc53b/roveminelulixevibonap.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/oaa0dpqrji5t892d195qast231/28730558470.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/jasurota.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/liluvikugip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jaszczak+phantom+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 10560 bytes
SHA-256: be6285aaba7ed81cb900188a2cd3c29581173ae475d8645dbe74fc551565ba7b
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 16476 bytes
SHA-256: 34d9672ce2f2e9833766c63049f601c33e8c16ff76a4ed9576b099fe9d8b1314
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1